How to be a strong atheist in a rather straightforward way

[TruthWorthy]

This is reminiscent of an opiate high. Then again, the endogenous opioids include all endorphins, dynorphins and opiates. So, you got 'high' on life. It happens - that doesn't prove there is a Holy Spirit, only that you have assigned the term 'Holy Spirit' to the chemical over/under stimulation of your brain in a manner that may be provoked multiple times, a psychosomatic disorder if you will.

Actually I think it constitutes psychological disorder, true that PNS (peripheral nervous system) would interact via endocrine system, etc as Synackron pointed out, that psychosomatic is more of a pop term that is over used and misunderstood in general much like "multipersonality disorder".
A little trivial: psycho, of the psyche; soma, also from latin meaning of the body.

[you explaining to EvF what inner peace is like]

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EvF- I can feel inner peace from finishing a good book, satisfying some inner desire, or helping a friend through a rough time in his life etc.. It's easily measurable, repeatable, susecptable to peer experience and doesn't affect my immediate ability to commmunicate or change my physiology (save for a mild pleasure). I feel calm and satisfied, patient and completely passive. This isn't the same as peace from God. The foolowing are perceptions from me only: That peace starts as a warm all over feeling with a heavy tingle, then for me it makes me almost giddy and happy with the world around me. I'm speechlesss and feel if I speak the air would just escape and never come back in. Time sort of slows. Thoughts, not in line with what I was thinking, suddenly pop to the front of my consciousness. Simply focusing on that thought instintaneously plans flash on how to accomplish it, the end result and post plan conversations. All warmth and tingle continues to steadily increase until I've gathered the plans and made a choice of action towards/away from that. Then it's instintaneously back to the how I was before, the only thing that remains are a few hairs on the neck standing up and a new plan and purpose in the forefront of my consciousness.

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Would please explain how the holy spirit is experienced? In what ways is it more powerful?

TW- I've been through depression to elation and nothing in the wide range of emotions I've been though in my life (possible including some unproven drug use) isn't even a 1/50th of the sum of the holy spirit. If it was closer it would seem more feasible to be just another strong emotional response, but it doesn't. I'm not saying it's not a physiological reation, just that its source isn't from self.

If you said that you were walking down the street and all of a sudden it starts bucketing rain, saturating you and a heavy winds sweeps through you and you become freezing cold then you can say outside forces made you feel 'freezing cold' physically - no problem, right?!
It's the same with emotions. You could be on your way to work and (I would get this checked out if I were you) experience the holy spirit - unexpectedly and without attributing good feelings to real life circumstances like happy with job, life, seeing what god does for you, etc.
If you're experiencing god 'emotionally' and there's no sense behind it go and get a fkn cat scan or an mri (magnetic resonance imaging) too be sure [who knows, the experience might be god's way of telling you that something needs looking into]. At least make some enquiries - with professionals - Don't take it the wrong way, but it could very well be a tumor or environmental poisoning (less likely).